Ohm's law

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Ohm's law, named after its discoverer Georg Ohm , states that the potential difference or Voltage drop V between the ends of a conductor and the current I flowing through the conductor are proportional at a given temperature:

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:

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rac{V}{I} = R

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The equation yields the proportionality constant R, which is the electrical resistance of the device.

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The law is strictly true only for resistors whose resistance does not depend on the applied voltage, which are called ohmic or ideal resistors or ohmic devices. Fortunately, the conditions where Ohm's law holds are very common. However, if R is assumed to be constant, then Ohm's law is never completely accurate for "real world" devices because no real device is an ohmic device for every voltage and current. At some level, the device will open or short, for example, by burning up or arcing.

Georg Ohm: Georg Simon Ohm, (March 16, 1787,(or 1789) Erlangen, Germany - July 6, 1854,Munich) German physicist, was born in Erlangen and educated at the university there....

Voltage drop: Voltage drop is a reduction in voltage in an electrical circuit. This effect is observable in a variety of different situations, and can be deliberate or an undesirable side-effect of something else....

Conductor: Conductor may have the following meanings....

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